Hugo schweitzer



V UNITED STATES PATENT OFFICE.

HUGO SCHWVEITIZER, OF NEW YORK, N. Y., ASS IGNQR TO HIMSELF AND EDWARD N. DICKERSON, OF SAME PLACE.

PROCESS OF PRINTING FIGURED ANlLlN-BLACK.

SPECIFICATION forming part of Letters Patent No. 539,550, dated May 21, 1895.

Application filed February 12, 1895. Serial No. 538,133. (No specimens.) I

To all whom it may concern:

Be it known that I, HUGO SOHWEITZER, of the city, county, and State of New York, have invented a new and useful Improvement in Processes of Printing and Developing Colors on the Fiber, of which the following is a full,

true, and exact description.

My invention consists in the production of colored patterns or figures on aniline black grounds by printing on the cloth a mixture, which, during the process of the application and development of aniline black, does not only prevent the formation of black on the printed parts, but produces itself a color.

If I take, for example, the nitrosamin from the diazo compound of paranitranilin, in itself no color, and mix it with the sodium salt of beta naphthol and oxide of zinc and a proper thickening, as hereinafter described, and print this mixture on white cloth which is atterward dyed with any of the known anilin black mixtures, the acid present and generated during the development of anilin black produces a red color from the nitrosamin and beta naphthol, and I obtain a red pattern on black ground.

I-leretofore in using the nitrosamin compound for the production of red figures on anilin black grounds, it has been found that a certain decomposition sets in and that no orange or red can be obtained if the ordinary resist mixtures are used. (See Faerber Z62 ttmg, January 1, 1895.) Using, however, as I do, oxide of zinc in the mixture, it is possible to produce very fast red figureson the black ground.

Instead of the above nitrosamin compound other nitrosamins may be used, and instead of the beta naphthol other chemicals, such as resorcin, metaphenylenediamin, naphthionic acid, amidonaphtholsulfo acid, salicylic acid and resorcylic acid, which are usually employed for developing colors on the fiber, may be applied, and thus quite a variety of colors may be produced. I

Instead of printing the above mixture first and afterward applying the anilin black, I can apply the anilin black first, according to comes brighter and faster if a very small quantity of nitrite of soda is added to the mixture to be printed on, the nitrosamin being thus more conveniently converted into the diazo compound.

To carry out my invention, I proceed as follows: I take fifty grams of beta naphthol finely eomminuted, which are stirred into fourteen grams of caustic soda dissolved in very little Water. The mixture is then made up into a thick paste with gum tragacanth solution. Then fifty-eight grams paranitrophenylnitros am-in or seventy-two grams of the sodium salt (with one molecule of water of crystallization) or the equivalent amount of the commercial paste are mixed together with gum tragacanth solution. These two mixtures are then stirred together and about two to three kilos of oxid of zinc are added and enough gum tragacanth solution is mixed with it to make the whole mass of the consistency of a good printing color. This mixture is then printed on the cloth as a resist or discharge with anilin black, in the well known manner I do not restrict myself to the above given quantities,but mean to include any reasonable change of the proportions.

When in this specification I refer to nitrosamin, I mean thereby to refer also to all its equivalents, namely, compounds of a similar nature, in themselves no dyestuffs, which, however, during the subsequent treatment are converted into colors.

When I refer to beta naphthol in this application, I refer also to the described equivalents.

What I claim as my invention, and desire to secure by Letters Patent, is-

The process of producing colored patterns or figures on anilin black grounds, by printing a mixture of nitrosamin, sodium salt of beta naphthol, oxid of zinc, and a proper thick- 5 ening on the cloth, and applying aniiin black thereto, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HUGO SOHWEITZER. \Vitnesses:

ANTHONY GREF, H. OOUTANT. 

